Ok as I am not a Formal guy by experience just by memory from the 70’s why is it do you suppose that this car has these Newportisms? Wheel lip openings instrument panel etc to what end or is this a Canuck car thing?
The Newport style wheel lip mouldings are standard on the New Yorker when not equipped with the optional skirts, it's just that 98% of New Yorkers were ordered with the skirts. When you ordered skirts on the New Yorker, you got the cleaner looking front wheel opening trim that matched the w/o trim on the skirts. When you ordered skirts on a Newport, you got New Yorker w/o trim on the skirt and Newport w/o trim on the front fenders.
I think Stan has it right on the dash trim. Someone took it apart for a repair and broke the trim piece. The New Yorker trim is quite fragile, while the Newport trim is thicker plastic and will handle more abuse. Even with the low miles, it wouldn't be unusual for it to be apart. Our '78 was only five years old when we bought it, with 24K miles, and I had the dash apart several times in the following few years. First for the radio, then for the clock, then the ATC II, then the radio again some years later.
The wheelcovers probably came off of the same car that the dash piece did. The owner may have lost one of the NY'er covers or just liked the Newport ones better.
I wouldn't be too concerned with that stuff. As long as there is no rust, or very minor rust, I'd say that it's a safe bet. The guy that Gary bought his S-23 from recently sold a '76 or '77 NY'er coupe that had 35K miles on it for $6K US. Despite the low miles, it was not garaged kept, and didn't look as nice as the one you are thinking about. It was rust free and had road wheels, but the light blue metallic paint had lost it's shine, making it look like a higher mileage car. The light blue interior didn't look as fresh either, though the leather on the driver seat was probably a bit better.
Jeff